Rotary blower, rotary pump, and the like.



T. SHEPHERD &. J. S. HAYES.

ROTARY BLOWER, ROTARY PUMP, AND THE LIKE.

APPLICATION FILED 0CT.14. I913.

1,1 58,733. Patented Nov. 2, 1915.

4 SHEETSSHEET l.

T. SHEPHERD &. J. S. HAYES.

ROTARY BLOWER, ROTARY PUMP, AND THE LIKE.

APPLICATION FILED OCT-14.1913.

4' SHEETSSHEET 2.

T. SHEPHERD &. J. S. HAYES. ROTARY BLOWER, ROTARY PUMP, AND THE LIKE.

Patented Nov. 2, 1915.

4 SHEETSSHEET 3- T. SHEPHERD &. J. S. HAYES. ROTARY BLOWER, ROTARY PUMP, AND THE LIKE.

APPLICATION FILED OCT- I4. 1913.

1,158,733. Patented Nov. 2, 1915.

4 SHEETS-SHEET 4.

TI-IDMAS SHEPHERD AND JOSEPH STANLEY HAYES, OF MANCHESTER, ENGLAND.

ROTARY BLOWER, ROTARY PUMP, AND THE LIKE.

To aZZ whom it may concern:

Be it known that we, THOMAS SHEPHERD and JOSEPH STANLEY HAYES, subjects of the King of Great Britain and Ireland, and residents of Chorlton-on-Medlock, Manchester, and Moss Side, Manchester, respectively, in the county of Lancaster, England,

-have invented certain new and useful Improvements in I Rotary Blowers, :Rotary I I I 7 ma specification.

Pumps, and the like,o' f whichthe following 1 Our invention relates to improvements in rotary blowers of the Roots type though 7 i such improvements are likewise applicable to rotary pumps and like apparatus in which arms or vanes are adapted to rotate so as to compress and circulate air,"force water Or other liquids for various purposes [though again the'improvements are equally applicable where the vanes are forced round by the pressure of a liquid or fluid.

, Our improvements'in the above types of apparatus refer to the construction and arthe vanes have either been'madeadead fit. asto their hearing ends with thecyl1nder,- casing or the like in which they rotateor are rangement of the vanes andparticularly to the provisionfof adjusting means for keeping the extreme ends of the vanes Previous to the date of our invention rotated or have been provided with nonable material secured thereto and bearing case do not way that 'it can easily conform to any inadjustable "strips of leather or other suitdirectly against the internal face of the out and requireto be renewedand'in any preserve a permanently tight the end of each vane which is adapted to float within the end of'the vane in such a equalities'there may be 'inthe internal surface of the casing or cylinder, that is to say,flwhere the cylinder is not concentric to the axis of'rotation offthe vane or where the hereof the cylinder from end to endis somewhat tapered or not true.

1 A further featureo-f-ourinvention is to cause the vane to have'aresilient action for the purpose just referred to and likewise' to provide means by which the fitting strips can be adjusted tobear with any de-' sired pressure upon the internal surface of;

Specification of Letters Patent.

the view being a transverse section,

Fig. 3 transverse'section through 9 transverse section the vanes are rotated.

' in the slot.

Patented Nov. 2, 1915.

Application filed October 14, 1913. Serial No. 795,163.

the latter case the fitting strips can be adj usted to bear quitelightly against the internal' surface of the cylinder or casing while maintaining a liquid or fluid tight :IOIDl}.

Our invention will be fully described with reference to the accompanying drawings in which,

Figure 1 shows the application of our improvements to a blower of the Roots type, Fig. 2 the vanes, one of the arms, Fig. 4 modified arrangement of the front elevation of arms carrying arms shown in Fig. 3, F igsQ 5 and 6 front elevation and sectional plan respectively of one of the vane; arms showing modified "means for adjusting the-fitting strip, Fig. 7

front elevation showing the adjustment of that portion of the fitting strip within one of the vane arms, Fig. 8 plan of an intermediate joint in the fitting strip and Fig.

of the fitting strip showing the application thereto of a narrow strip to form the actual fitting surface. cylinder or casing. Such strips soon wear" In the aforesaid drawings indicates the of 'theblower casing or cylinder-in which In accordance with our invention and referring first to Fig. 1, each vane arm 6 is slotted from end to end so as to receive a narrow'rail or fitting strip e, the outer edge of which bears against the internal face (Z while the side faces bear with- The rail may extend inone length from end to end of the casing in which it rotates or may be divided into sections as hereinafter referred to in connection with the modifications shown in Figs. 2 and 3. The rail is adapted to move freely within the slot and its inner edge rests upon springs f, the inner ends of which again rest on-bearing blocks 9 provided with inclined inner faces adapted to be engaged by slidable wedges h arranged transversely in the arms I), such wedges being adjusted so as to raise or lower the blocks'by screws 2' extending from them carrying adjusting nuts j. It will be seen that by drawing the wedges toward the nuts the springs j are compressed so as to react with pressure upon the strip 6 and force its outer edge against the surface d. On the other hand when the wedges are moved in the opposite direction the springs are allowed to expand and release the pressure on the spring ,6. It w1ll be seen that thearrangement provides the vanes with floating fitting strips adapted to conform to the inequalities of the cylinder and also, in the case of blowers, to conform or fluid tight joint. The wedges h may be adjusted from the opposite side by set screws instead of the screwed shanks pre viously referred to. The outer edges of the c fitting strips may bear directly against the surface cl or may be provided with narrow provided with tommy holes 3 to enable them to be turned round. Fig. 6 shows a sectional plan of the arrangement.

Fig. 8 indicates an overlapping joint secured by screws ,2 for the fitting strip where the latter is: madein sectionsas in Figs.

. with the curved surfaces In near the axis of the vanes so as to always maintain a liquld The arrangements hereinbefore described give perfect. contact'wi ht e internal surface of the cylinder or casing without undue friction and with ut any thumping or poundingor'straining of" the working parts. 7 The arrangement also permits of a high ra of duty being maintained at slow{' speed while the working .pa'rtscan be replaced inserted strips m of brass or the like as shown in Fig. 9. 7

Like parts in the var1ous vlews are 1nd1- catecl by s m lar reference letters.

In Figs. Qand 3 the fitting strips 6 are adapted to float and are arranged in a similar mannerto those shown in Fig. 1 but the bearing blocks 9 are adjusted by means of set-screws n'which are looked after adjustment by lock nuts 0. In other respects the arrangement acts in a similar'way to that already described. Figs. 2 and 3 show the fitting strip 6 divided into three parts two of the parts being within the arms 6' and the third between the arms. The slotted portion p forms a continuation of the slotted end of the arms Z2 and carries the central portion of the fitting strip. It is secured to the slotted arm portions by lugs and screws 9. This construction is adopted where it is not desired to carry the vane arms in one plece from end to end of the' cylinder and also for the sake of lightness,

the space between the inner edges of the vane arms I), the shaft a and the under side of the slotted portion 79 being filled in with .a sheet metal panel 1 secured to the parts referred to by set-screws, bolts or the like and lugs as indicated at s.

Fig. 4 indicates a further modification in -which the fitting strip 6 is limited as to its movement away from the axis. With this 3, object screws 25 are fixed in the strip 6, pro: ject through the springs f and the lower part of the vane arms I) where they are provided with adjusting and locking nuts u,

strips, and screws engaging with holes in "which limit the movement of the strip 6 outwardly and allow of its adjustment with relation to the surface 03 while admitting of V floating inwardly. A further feature is the w easily and rapidly and at less expense, since only the fitting strips may require renewal.

This is especially important where the ap-.

paratus is dealing-with liquidssuch as acids rgrtt-y liquid In g neral h arrang ment of the floating vanes gives: a longer orking life to t e parts and a mors sa i factory operation during working, i b

What we claims our nv nt on nd deslre to se ureby Let s Pat nt 1. The combina on, Wi h a c s g having hemispherical end portions, and two intercurrent rotors journaled; therein and provided upon opposite sides with curved surfaces similar to those ofthe said end portions, and having alsovanes provided with radial slots intheir edges; of packing strips .slidable radially inthe said slotsand arranged to bear against the curved surfaces of the casing and rotors, and springs which press the said strips outwardly in the slots.

2. The combination, with a casinghaving hemispherical ends, and two intercurrent, rotors j ournaledtherein and provided upon opposite sides with curved surfaces similar to those of the casing, andhaving also vanes provided with radial slots in their edges; of'packing strips slidable radiallyin the said slots and arranged to bear against the curved surfaces of the casing and rotors,

bearing blocks also slidable in the slotsunder the said strips,spring s interposed between the said bearing blocks and packing the portions of the vanes which form the ing blocks outwardly in the slots.

3. The combination, wlth a casing havingj eccentric hemispherical end portions, and two lntercurrent rotors ournaled thereln,

bottoms of the slots and forcing the beareach rotor being formed of similarsections having radial vanes provided with radial slots in. their outer edges, slotted distance,"

bars secured between the slotted portions of set our hands in the presence of two witthe vanes, and closing plates secured to the nesses; said bars and vanes; of packing strips slidi THOMAS SHEPHERD. able radlally 1n the slots of the vanes and 5 bars and arranged to bear against the end JOSEPH STANLEY HAYES portions of the casing, and springs which Witnesses: force the strips outwardly in the slots. WILLIAM W. TAYLER, In testimony whereof We have hereunto AMY EVELINE EVANS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

